Activity identifiers are special cases in Q

[notshi]

Technically, a comma is not listed as a symbol that shouldn't be used, but we found that if an activity identifier has commas, Q will not find it because it uses the comma as a separator; ie. you can search for 2 or more identifiers this way.

This is now disabled in Q since commas can occur in identifiers (eg).

Note
Q is our internal (and old) API but has been used by many over the years.
This could break things with current users so we will wait and see if anyone complains.